Use of the analytical modeling of recession to describe a dual-aquifer effect

Rutledge, A.T.

doi:10.1007/s10040-021-02440-x

Cited by 1 publication

(3 citation statements)

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“…In the simple form, it can be conceptualized as a basin that consists of two subbasins of differing recession index. Rutledge (2022) illustrated the dual‐aquifer effect and showed results for a basin in which the dominant recession index is 50 days/log cycle yet a secondary index is 200 days/log cycle. The first is considered dominant because it represents 90% of the basin.…”

Section: Secondary Recession Characteristicsmentioning

confidence: 99%

“…The publication includes example simulations for streamflow basins showing semilog plots and linear plots, demonstrating that the semilog plot can exaggerate the effect of small flow anomalies. Another publication (Rutledge, 2022, cited above) shows a comparison between the PULSE model and MODFLOW.…”

Section: Secondary Recession Characteristicsmentioning

confidence: 99%

“…Departures have been attributed to a wide array of different mechanisms as noted by Hall (1968). More recently, the author has compiled a list of about 25 references describing the various mechanisms (Rutledge, 2022). Because groundwater-level recession requires data to be expressed relative to the outflow boundary, it is important to recognize that any uncertainty about the outflow boundary can lead to multiple interpretations of the shape of the recession curve.…”

Section: Research Impact Statementmentioning

confidence: 99%

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Comments about selected recession parameters

Rutledge¹

2023

J American Water Resour Assoc

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Recession analysis can be used for qualitative comparisons between basins and for quantitative analysis involving the slope and the shape of the recession curve. The groundwater‐level recession hydrograph can be used to derive an estimate of the hydraulic diffusivity of a surficial aquifer. The recession index can be obtained from streamflow data and from a formulation that includes aquifer properties. The analysis of the method reveals nonlinear recession which can result from the down‐valley flow component, a dual‐aquifer effect, and leakage to or from the aquifer. Important concepts include the dominant recession index and secondary recession characteristics which can affect low flow. Under conditions of down‐valley flow, the cross‐valley flow component tends to be important for determining recession characteristics, including hydraulic diffusivity and the recession index. These findings are relevant to another recession parameter a which is the distance from the stream to the hydrologic divide and results are supported by test simulations of a technique for estimating recharge.

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Section: Secondary Recession Characteristicsmentioning

confidence: 99%

Section: Secondary Recession Characteristicsmentioning

confidence: 99%